HF Drivers</br>ProAudio HFDev</br>Throat Size 1-Inch</br></br>Product Description</br></br>EMINENCE 1" DRIVER BOLT ON 1-Inch Throat Size HF Device Eminence Driver Bolt Mounting Holes Diameter 2X M6 Mounting Holes Diameter 2X M6</br><br/>http://www.amazon.com/gp/product/B00HYDI7ZG